I have a GUI that wont add a weapon to the players backpack. Why wont it work?

I have a sword in lighting and have this as a local script in a text button

local button = script.Parent
	button.Selected = true
local player = game.Players.LocalPlayer
local starterSword = game.lighting.ClassicSword
 function onClicked()
	if button.Selected == false then
		script.Parent.Parent.Parent.Enabled = false	
		local playersword = starterSword:Clone()
		playersword.Parent = player.Backpack
		button.Selected = true
	elseif		
		button.Selected = false
	end
end

This is my script but nothing happens

You had a few simple mistakes in your script, so I fixed it for you! Here is the result:

local button = script.Parent
button.Selected = true
local player = game.Players.LocalPlayer
local starterSword = game.Lighting.ClassicSword
	function onClicked()
		if button.Selected == false then
			script.Parent.Parent.Parent.Enabled = false 
	        	local playersword = starterSword:Clone()
	        	playersword.Parent = player.Backpack
	        	button.Selected = true
		else    
			button.Selected = false
		end
	end
end

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